@article{697e0ca673104055ba6bbaed411a4cb0,
title = "Physical Properties and Gas Hydrate at a Near-Seafloor Thrust Fault, Hikurangi Margin, New Zealand",
abstract = "The Pāpaku Fault Zone, drilled at International Ocean Discovery Program (IODP) Site U1518, is an active splay fault in the frontal accretionary wedge of the Hikurangi Margin. In logging-while-drilling data, the 33-m-thick fault zone exhibits mixed modes of deformation associated with a trend of downward decreasing density, P-wave velocity, and resistivity. Methane hydrate is observed from ~30 to 585 m below seafloor (mbsf), including within and surrounding the fault zone. Hydrate accumulations are vertically discontinuous and occur throughout the entire logged section at low to moderate saturation in silty and sandy centimeter-thick layers. We argue that the hydrate distribution implies that the methane is not sourced from fluid flow along the fault but instead by local diffusion. This, combined with geophysical observations and geochemical measurements from Site U1518, suggests that the fault is not a focused migration pathway for deeply sourced fluids and that the near-seafloor Pāpaku Fault Zone has little to no active fluid flow.",
author = "Cook, {Ann E.} and Matteo Paganoni and Clennell, {Michael Benedict} and McNamara, {David D.} and Michael Nole and Xiujuan Wang and Shuoshuo Han and Bell, {Rebecca E.} and Solomon, {Evan A.} and Saffer, {Demian M.} and Barnes, {Philip M.} and Pecher, {Ingo A.} and Wallace, {Laura M.} and LeVay, {Leah J.} and Petronotis, {Katerina E.}",
note = "Funding Information: This research used data and samples provided by the International Ocean Discovery Program (IODP). We gratefully acknowledge IODP, Texas A&M University staff, Schlumberger Drilling & Measurements, the crew of the JR, and the Expedition 375 and 372 science parties. We thank Schlumberger for the Techlog software donation. We thank A. Malinverno and G. Guerin for their comments and suggestions on this paper. Cook was supported by National Science Foundation (NSF) award 1752882; Paganoni was funded by Natural Environment Research Council (NERC) grant NE/R016615/1 and Bell from NERC grant NE/S00291X/1; Wang was supported by National Natural Science Foundation of China (41976077), and McNamara was supported by the Geological Survey Ireland. Barnes and Wallace acknowledge support from the New Zealand Endeavour Fund, contract CO5X1605, as well as NIWA and GNS SSIF core funding. LeVay and Petronotis were supported by IODP-JRSO NSF award 1326927. Funding Information: This research used data and samples provided by the International Ocean Discovery Program (IODP). We gratefully acknowledge IODP, Texas A&M University staff, Schlumberger Drilling & Measurements, the crew of the , and the Expedition 375 and 372 science parties. We thank Schlumberger for the Techlog software donation. We thank A. Malinverno and G. Guerin for their comments and suggestions on this paper. Cook was supported by National Science Foundation (NSF) award 1752882; Paganoni was funded by Natural Environment Research Council (NERC) grant NE/R016615/1 and Bell from NERC grant NE/S00291X/1; Wang was supported by National Natural Science Foundation of China (41976077), and McNamara was supported by the Geological Survey Ireland. Barnes and Wallace acknowledge support from the New Zealand Endeavour Fund, contract CO5X1605, as well as NIWA and GNS SSIF core funding. LeVay and Petronotis were supported by IODP‐JRSO NSF award 1326927. JR Publisher Copyright: {\textcopyright}2020. American Geophysical Union. All Rights Reserved.",
year = "2020",
month = aug,
day = "28",
doi = "10.1029/2020GL088474",
language = "English (US)",
volume = "47",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",
number = "16",
}